from The American Heritage® Dictionary of the English Language, 4th Edition
- transitive v. To cause to diminish, as in strength, value, or quality: an injury that impaired my hearing; a severe storm impairing communications.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- v. to weaken; to affect negatively; to have a diminishing effect on.
from the GNU version of the Collaborative International Dictionary of English
- transitive v. To make worse; to diminish in quantity, value, excellence, or strength; to deteriorate.
- transitive v. To grow worse; to deteriorate.
- adj. Not fit or appropriate.
- n. Diminution; injury.
from The Century Dictionary and Cyclopedia
- To make worse; diminish in quantity, value, excellence, strength, or any other desirable quality; deteriorate; weaken; enfeeble: as, to impair the health or character; to impair one's fortune.
- Synonyms To lessen, decrease, reduce, injure.
- To become worse; be lessened or enfeebled; deteriorate.
- n. Diminution; decrease; loss; injury; disgrace.
- Unequal; unworthy; unjust.
- Not one of a pair; odd; unmatched.
- n. An impaired or odd thing; an article without a mate.
- n. In roulette, an odd number.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- v. make worse or less effective
- v. make imperfect
Middle English empairen, from Old French empeirer, from Vulgar Latin *impēiōrāre : Latin in-, causative pref.; + Late Latin pēiōrāre, to worsen (from Latin pēior, worse).(American Heritage® Dictionary of the English Language, Fourth Edition)
From Old French empeirier, from Vulgar Latin *impeiorare, from in- + Late Latin peiorare ("to make worse"), from peior ("worse"), a comparative of malus ("bad"). (Wiktionary)